Correcting a few things on the XM240 before putting it up would help.
Mine collected water inside the elements. The water ran down the X-hat
and into the hole used for mounting the X-hat. The plugs on the ends of
the elements served to keep the water inside. The loading coil is wound
on a hollow tube. That allows water to collect inside the loading coil
- not good at all. I plugged the hole at the X-hat, drilled some weep
holes and removed the element end caps. I did insert some stainless pot
scrubber material in the ends of the elements.
I also didn't like the sparks jumping from the reflector to the boom
when lightning was close, so I grounded the reflector to the boom. The
only thing that changes is the resonant frequency of the boom, which
could be a consideration for interaction with other antennas.
I think the boom to mast clamp could stand some improvement also.
Jerry, K4SAV
On 3/15/2014 7:39 AM, Wayne Kline wrote:
I have had Both of the antennas ...The hi Gain Dis-2 is a good antenna the
linear loading wires are problematic
if you live in a ICE area... I lost mine two times..... The Original CD40 had
a number of issues .
The XM240 is miles ahead of the original 2 element antenna. Mine has been up
two years and three heavy ice storms. The W6NL Maxon mod improves an
already good antenna
The weak spot on the XM240 is the boom to mast clamp... IMO I re-drilled the
plate for two High gain blocks
Wayne W3EA
Date: Sat, 15 Mar 2014 05:51:58 -0400
From: n1rj@roadrunner.com
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Discoverer 7-2 or Cushcraft xm-240
My choice would be the XM-240 with the W6NL Moxon modifications.
Much better F/B and bandwidth.
73, Roger
On 3/15/2014 12:49 AM, Glenn Pritchard wrote:
Hi guys
Have been pondering this over for a couple of months.
In the past my monobander for 40 has been KLM, however it's time to replace
this antenna and currently the antenna is down.
Question is, which of the two 40 meter yagis has the better track record?
I have never seen the hy-gain up close but the performance was pretty good
for a linear loaded system and the gov't had them for monitoring stations
in Canada.
As for the xm240, not sure.
Just looking for some input from those that may have experience with either
of these antennas.
Tnx,
Glenn, VE6ND
_______________________________________________
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|